fix(deploy): Initialize Firestore and Firebase Admin to fix startup

main.py

@@ -32,6 +32,9 @@ from ml.anomaly_detector import AnomalyDetector
 from auth.oauth_flow import get_authorization_url, exchange_code_for_token
 from auth.token_store import save_token
 
+
+from google.cloud import firestore
+import firebase_admin
 from firebase_admin import credentials, messaging
 import base64
 import json
@@ -47,6 +50,19 @@ app = FastAPI(
     version="0.1.0",
 )
 
+# ── FIREBASE & FIRESTORE INIT ───────────────────────────────────────────────
+db = None
+try:
+    # When running in Google Cloud, ADC will be used automatically.
+    # For local dev, `gcloud auth application-default login` is required.
+    firebase_admin.initialize_app()
+    db = firestore.Client()
+    print("Firestore client initialized successfully.")
+except Exception as e:
+    # The app can still run in a limited mode without Firestore.
+    # Endpoints that depend on `db` will return a 500 error.
+    print(f"WARNING: Firestore client failed to initialize: {e}", file=sys.stderr)
+
 # ── AUTH & SESSION ────────────────────────────────────────────────────────────
 # Add session middleware for storing auth state
 app.add_middleware(SessionMiddleware, secret_key=os.environ.get("SESSION_SECRET"))